Hot pressing of Yb:Y2O3 laser ceramics with LiF sintering aid

Identificador:  imarina:9226181

Handle: https://hdl.handle.net/20.500.11797/imarina9226181

Autors:  Balabanov, Stanislav; Permin, Dmitry; Evstropov, Timofey; Andreev, Pavel; Basyrova, Liza; Camy, Patrice; Baranov, Mikhail; Mateos, Xavier; Loiko, Pavel

Resum:
Transparent ytterbium doped yttria ceramics, 2 at.% Yb:Y2O3, were fabricated by hot uniaxial pressing in vacuum at 1550 degrees C/50 MPa followed by a two stage Hot Isostatic Pressing (HIPing) at 1200 1400 degrees C/100 MPa, using nanopowders obtained by self-propagating high-temperature synthesis (with lithium fluoride serving as a sintering aid). The addition of LiF during the powder synthesis markedly changed the morphology of powders, and at the stage of hot pressing, drastically reduced the carbon contamination of ceramics, as well as stimulated sintering without formation of the liquid phase. The spectroscopic properties of ceramics were studied. The stimulated-emission cross-section for Yb3+ ions is 0.90 x 10(-20) cm(2) at 1030.4 nm and the luminescence lifetime is 797 mu s. A continuous wave 2 at.% Yb:Y2O3 ceramic laser generated an output power of 735 mW at 1027 1034 nm with a slope efficiency of 64.5% and a laser threshold of 0.28 W.